The new Icy Dock ToughArmor MB516SP-B is an excellent option for fitting 16x SSDs into two 5.25" drive bay slots while providing easy cabling and hot-swap capabilities
SATASASSlimline SATAPCIeU.2 SFF-8639miniSAS HD SFF-8643Oculink SFF-8612Slimline SAS SFF-8654CFexpress Type BUSB3.0(USB3.2 Gen1)USB3.1(USB3.2 Gen2x1)USB3.2(USB3.2 Gen2x2)USB4Thunderbolt 3MCIO(SFF-TA-1016)No Preference